Flowserve QX Limitorque - Manual (Page 42)

Limitorque QX Electronic Actuator FCD LMENIM3314-00 – 5/11
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NOTE: Bushing (#1-2) is pressed on to housing. If bushing and/or housing is damaged a subassembly of the housing
with the bushing will have to be ordered from the factory.
4.8.2 Drive Sleeve, Mechanical Stops and Encoder Shaft Assembly Remounting.
Step 1, Encoder shaft seal.
(Special tool required, contact factory for ordering information)
Using tool from factory press oil seal (#1-3) into housing making sure that the open end of the seal is towards the base
of the unit. If some of the seal is torn, remove the excess.
Step 2, Encoder shaft assembly.
Insert the two ball bearings (#1-5), one on the encoder side and one on the unit base side. Slide the encoder shaft
(#1-6) through from the encoder side and using retaining ring pliers place retaining ring (#1-7) on base side of
encoder shaft. Ensure retaining ring is seated correctly in encoder shaft groove.
Step 3, Flat washer and small needle bearing.
(Special tools required, contact factory for ordering information)
NOTE: drive sleeve assembly must be removed before inserting washer (#1-8) and small needle bearing (#1-9).
Place flat washer (#1-8) in bottom of housing worm shaft bore making sure the washer is flat in bottom of housing
bore. Note that this washer is needed if worm shaft is to be removed at any time in the future.
Lubricate needle bearing (#1-9) and using special tools from Flowserve lightly press or hammer needle bearing into
housing until seated.
Step 4, Mechanical Stop assembly.
If needed replace ‘O’-ring (#1-13) on stop (#1-12). (Special tool can be order from factory for installing ‘O’-ring,
contact factory for ordering information).
Insert stops into housing and using a flat head screw driver turning in stop CW to about midpoint of the two grooves
on the stop.
NOTE: The two grooves on the stop is approximate min and max positions of stop travel by aligning grooves with
housing face. If stop is positioned out too far oil could leak by the mechanical stop ‘O’-ring. Stop positions will have to
be reset after mounting unit to valve.
Figure 4.23 - Stop Groove View
Step 5, Drive sleeve remounting.
If removed place new encoder insert (#1-10) into drive sleeve (#1-11) slot. Place drive sleeve in to housing aligning
drive sleeve with bushing (#1-2) and the insert with the encoder shaft flats. Rotate drive sleeve to each end of travel to
make sure that it turns smoothly. Leave loose for installing the worm shaft.